Prompt 1:

Person A is a homeless person who has sold him/herself to Person B, who is very wealthy. Person B now legally owns Person A. Most people in this situation have an abusive owner, but Person B just wants the best for Person A. 

Prompt 2:

Person A LOVES being tied up. That's all (s)he ever wants to do. (S)he'll have sex with anyone and everyone, especially if they are into bondage and degrading him/her. Person B is a sadist who stumbles upon Person A one day.

Prompt 3:

Person B sits on the couch, petting his/her neko, Person A. Person A purrs and curls up naked on Person B's lap.